The best way to measure public opinion is through opinion polls - B
With opinion polls you get an idea what is the general idea about a certain topic from the public, as you usually get a high enough sample to deduce the relevant information.
To answer your second question I would say it is either B or C as being a sole proprietor usually makes you subjec to being a small business or you're forced to use factors of production less efficiently.
The correct answer is Option D) Yellow River
The Yellow river is also known as the Huang He and is the second largest river in all of China.
It holds a special place in the history of the country as it is known as the birthplace of the ancient Chinese civilization.
Early civilizations all grew around large rivers which ensured plenty of water and great land.
The Egyptian Civilization grew around the Nile and the Indian civilization grew around the Indus River.
Similarly, the Yellow River gave birth to the early civilization in China, so much so that many historians say that the China we know today would not have existed if there was no Yellow River.
Question: What country north of China is closest to the huang he river?
Answer: Mongolia
